I have not heard yams help but ive heard avocados do :)
Yeah but its not the yams that you can buy in the grocery store since those are basically sweet potatoes. Real wild yams you either have to plant yourself or special order.
I don't think it is silly at all. Avocodos boost fertility as well. They have properties in them that are beneficial to the chemical and hormonal issues associated with fertility.
So, if I've been eating a lot of yams in the psat few months I should worry about having to buy 2 of everything? I wish I'd read this 3 months ago! =)